[Speech to Text] Add newest generated code and update tests

[lpatino10]

This PR adds the newest Speech to Text code as of the week of 03/05/18.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (next@3b2efbd). Click here to learn what that means.
The diff coverage is 57.81%.

@@           Coverage Diff           @@
##             next     #883   +/-   ##
=======================================
  Coverage        ?   42.31%           
  Complexity      ?     1442           
=======================================
  Files           ?      468           
  Lines           ?    11328           
  Branches        ?      579           
=======================================
  Hits            ?     4794           
  Misses          ?     6241           
  Partials        ?      293

Impacted Files	Coverage Δ	Complexity Δ
...ech_to_text/v1/model/SpeechRecognitionResults.java	20% <ø> (ø)	1 <0> (?)
.../developer_cloud/speech_to_text/v1/model/Word.java	57.14% <ø> (ø)	4 <0> (?)
...eech_to_text/v1/model/SpeechRecognitionResult.java	20% <ø> (ø)	1 <0> (?)
...developer_cloud/speech_to_text/v1/model/Words.java	100% <ø> (ø)	2 <0> (?)
...r_cloud/speech_to_text/v1/model/AcousticModel.java	38.46% <ø> (ø)	4 <0> (?)
...veloper_cloud/speech_to_text/v1/model/Corpora.java	100% <ø> (ø)	2 <0> (?)
...r_cloud/speech_to_text/v1/model/KeywordResult.java	0% <ø> (ø)	0 <0> (?)
..._cloud/speech_to_text/v1/model/RegisterStatus.java	100% <ø> (ø)	3 <0> (?)
...cloud/speech_to_text/v1/model/RecognitionJobs.java	100% <ø> (ø)	2 <0> (?)
...d/speech_to_text/v1/model/SpeakerLabelsResult.java	16.66% <ø> (ø)	1 <0> (?)
... and 29 more

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